Document Type and Number:
United States Patent 3800685
Abstract:
A duct constructed within a building, consisting of an upper and a lower horizontal duct passing horizontally through the building at the upper and the lower part thereof and a vertical duct connecting the upper and the lower horizontal duct within the building having the whole shape of the letter I, and the ducts being structured such that the static pressure in the place where the upper horizontal duct intersects the vertical duct is less than that in the region where the lower horizontal duct does the vertical duct, and an ascending air current is thus generated in the vertical duct by means of the wind.
Application Number:
05/284751
Publication Date:
04/02/1974
Assignee:
Tokyo Gas Co. Ltd. (Chuo-ku, Tokyo, JA)
International Classes:
F24F7/04; F24F13/00
Field of Search:
98/32,33R,33A,20 417/151
US Patent References:
| 1391217 | System of ventilation | September 1921 | Stewart | |
| 1056989 | | March 1913 | Hammond | |
| 1250927 | | December 1917 | Mead | |
| 2084787 | Method and apparatus for ventilating an enclosed space | June 1937 | Zoustinsky | |
Primary Examiner:
Wye, William J.
Attorney, Agent or Firm:
Wenderoth, Lind & Ponack
Claims:
What is claimed is
1. An air supply and exhaust duct system for a building comprising:
2. The device of claim 1 wherein the cross-sectional area of said upper horizontal pipe member is greater than the cross-sectional area of said lower horizontal pipe member.
3. The device of claim 1 wherein a static chamber is provided in the region where said vertical pipe member intersects said lower horizontal pipe member and said upper and lower horizontal pipe members having substantially equal cross-sectional areas.
4. The device of claim 1 wherein an accelerating chamber is provided in the region where said upper horizontal pipe member intersects said vertical pipe member and said upper and lower horizontal pipe members having substantially equal cross-sectional areas.
5. The device of claim 4 further comprising a static chamber in the region wherein said vertical pipe member intersects said lower horizontal pipe member.
Description:
SUMMARY OF THE INVENTION
This invention relates to an air supply and exhaust system constructed within a building and consisting of an upper and a lower horizontal duct passing horizontally through the building at the upper and the lower part thereof and a vertical duct connecting the upper and the lower horizontal duct within the building and having the whole shape of the letter I.
In the I-shape system a fan may be considered often attached within the vertical duct or in the upper horizontal duct in order to increases circulation and improve combustion current in the vertical duct.
It is the object of the present invention to generate an ascending air current in a vertical duct by means of the wind.
BRIEF EXPLANATION OF THE DRAWINGS
FIG. 1 shows an I-shape system which makes it possible to reduce the resistance of air flowing in the lower horizontal duct less than that of air flowing in the upper horizontal duct.
FIG. 2 is a view of I-shape system provided a static chamber in the lower horizontal duct in the region intersecting the vertical duct.
FIG. 3 shows an I-shape system including an accelerating chamber in the upper horizontal duct in the region intersecting the vertical duct.
FIG. 4 shows an I-shape duct provided an accelerating chamber in the part where the upper horizontal dict intersects the vertical duct and a static chamber in the part where the lower horizontal duct intersects the vertical duct.
DETAILED DESCRIPTION OF THE INVENTION
This invention relates to a duct constructed within a building, consisting of an upper and a lower horizontal duct passing horizontally through the building at the upper and the lower part thereof and a vertical duct connecting the upper and the lower horizontal duct within the building, the system having the shape of the letter I and wherein an ascending air current is to be generated in the vertical duct at wind blowing.
As shown in the embodiment FIG. 1, this embodiment is constructed such of that the cross-sectional area of the upper horizontal duct 1 is larger than that of the lower horizontal duct 2, so that the resistance of air flowing in the upper horizontal duct 1 is to be less than that of air flowing in the lower horizontal duct 2.
In this state, when the ducts are influenced by wind currents from the direction of the arrow, air flows from A to A' and from B to B', and as the resistance of the air flowing in the upper horizontal duct 1 is less than that of the air flowing in the lower horizontal duct 2 the wind velocity in duct 1 becomes greater than that in the lower horizontal duct 2.
The air in the vertical duct 3, therefore, is sucked upwardly into the upper horizontal duct 1, and an ascending air current is thus generated in the vertical duct 3 as shown by the arrow.
In the embodiment of FIG. 2, the resistance of air flowing in the upper horizontal duct 1 and the lower horizontal duct 2 is the same, and a static chamber 4 is provided in the region where the lower horizontal duct 2 intersects the vertical duct 3.
In this manner an ascending air current is created in the vertical duct, when wind pressure influences the ducts from the direction of the arrow and the air in the vertical moves to the upper horizontal duct 1 because the static pressure in the region where the upper horizontal duct 1 intersects the vertical duct 3 is less than that in the static chmaber 4.
FIG. 3 shows a third embodiment, where the resistance of air flowing through the upper horizontal duct 1 and the lower horizontal duct 2 is generally the same and an accelerating chamber 5 is constructed in the region where the upper horizontal duct 1 intersects the vertical duct 3.
In this embodiment, when the ducts are influenced by wind currents from the direction of the arrow, the air in the vertical duct 3 is turned into ascending air currents as shown by the arrow through moving to the upper horizontal duct 1, as the static pressure in the accelerating chamber 5 is less than that in the part where the lower horizontal duct 2 intersects the vertical duct 3.
FIG. 4 shows a fourth embodiment, where the upper and the lower horizontal duct are so constituted as generally have the same resistance to flowing air, and in the narrow region where the upper horizontal duct 1 intersects the vertical duct 3 an accelerating chamber 5 is provided. Static chamber 4 is constructed in the enlarged part where the lower horizontal duct 2 intersects the vertical duct 3.
In this manner, when the ducts are influenced by wind currents from the direction of the arrow, the static pressure in the accelerating chamber 5 is less than that in the static chamber 4, and the air in the vertical duct 3 moves to the upper horizontal duct 1 as shown by the arrow.
The present invention constructed as described above is able to generate an ascending air current in the vertical duct 3 by means of the prevailing winds. And the ascending air current in the vertical duct 3 may effectively increase suction of air and exhaust of exhaust gas, when air for combustion is sucked into the vertical duct 3 and exhaust gas of combustion of exhausted into the same vertical duct and then into the upper horizontal pipe.